[50.31] The Parsec-Scale Radio Structure of X-Ray-Selected BL Lacs

AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 50. High Angular Resolution Science with the NRAO Very Long Baseline Array
Display, Tuesday, June 1, 1999, 10:00am-7:00pm, Southwest Exhibit Hall

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[50.31] The Parsec-Scale Radio Structure of X-Ray-Selected BL Lacs

T.A. Rector (NOAO), D.C. Gabuzda (ASC/Lebedev Sci. Inst.), J.T. Stocke (CASA - Colorado)

We present first-epoch VLBA observations obtained as part of a program to study the parsec-scale radio structure of a sample of twelve X-ray-selected BL Lacs (XBLs) chosen to span the observed range of spectral energy distributions for XBLs. Whereas radio-selected BL Lacs (RBLs) show a bimodal distribution of parsec- and kpc-scale jet alignment angles, all of the XBLs that are resolved on poth parsec- and kpc-scales have well-aligned jets. This can be interpreted as support for orientation models in which XBLs are believed to be seen further off-axis than RBLs. Alternatively, XBL jets may be intrinsically straighter than those found in RBLs. This may be due, perhaps, to their intrinsically lower power levels.

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